How do you determine the size of an object in C++?

Question

For example, say I have a class Temp:

class Temp
{
    public:
        int function1(int foo) { return 1; }
        void function2(int bar) { foobar = bar; }         


        

Answer 1

The size of an object of a class is equal to the sum of the sizes of all the data members of that class. For example if I have a class

class student
{
private:   
   char name[20];
   int rollno, admno;
   float marks;

public:
  float tmarks, percentage;

  void getdata();

  void putdata();
};

Now, if I make an object of this class, say s1, then the size of this object will be 36 bytes:

[20(name)+2(rollno)+2(admno)+4(marks)+4(tmarks)+4(percentage)]